<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <!-- 头部组件 -->
        <Header :addTodo="addTodo"/>
        <!-- 列表组件，把todos数组传递给List -->
        <List :todos="todos" :deleteTodo="deleteTodo" :checkTodo="checkTodo"/>
        <!-- 底部组件 -->
        <Footer :todos="todos" :clearCheckedTodo="clearCheckedTodo"/>
      </div>
    </div>
  </div>
</template>

<script>
  import Header from './components/Header.vue'
  import List from './components/List.vue'
  import Footer from './components/Footer.vue'

  export default {
    name: 'App',
    components:{Header,List,Footer},
    data() {
      return {
        // 要做的事的初始值
        todos:[
          {id:'uasfdyta01',title:'吃饭',done:false},
          {id:'uasfdyta02',title:'睡觉',done:true},
          {id:'uasfdyta03',title:'打台球',done:false}
        ]
      }
    },
    methods: {
      // 用于向todos数组中添加一个todo对象
      addTodo(todo){
        // 将收到的todo对象添加进去
        this.todos.unshift(todo)
      },
      // 用于从todos数组中删除一个todo对象
      deleteTodo(id){
        this.todos = this.todos.filter( item => item.id !== id)
      },
      // 用于勾选/取消勾选一个todo
      checkTodo(id){
        this.todos.forEach((item)=>{
          if(item.id === id){
            item.done = !item.done
          }
        })
      },
      // 用于清除所有已完成的
      clearCheckedTodo(){
        this.todos = this.todos.filter( item => item.done === false)
      }
    },
  }
</script>

<style>
/*base*/
body {
  background: #fff;
}
.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}
.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}
.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}
.btn:focus {
  outline: none;
}
.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>